Can you add an arrow to where their signature is? I can't see a signature in the screen grab you provided (your thread says "same signature") the title of their post would no doubt come from clicking "reply" hence it looks the same and as to their actual post they would have had to fill in this form:
The 1st screen is from one old bounty where those accounts have done an application. This is not the latest bounty they had participated on so now their signature it's gone, for a ban or because they remove it, but the application for the bounty is still there.
Since it is a very old bounty for a different signature/avatar(I'm pretty sure the ban on one account remove the signature) it quite strange that they posted in a short amount of time on the DESICO bounty, and after some months they all have the same different signature.
... my opinion is I think you found a bounty and scrolled every page until you saw a handful of signatures that were for the same signature campaign and said "Gee, they must be the same because the majority (97%) don't have a signature."
Absolutely not, I will not look for every bounty on the forum for every page and scroll for this particular.
I do not reconcile the motivation for which I struggled on one of these profiles, but I found myself on looking at the chronology of one and I found an ethereum address, and where I live se say "from what is born what".
As I consider myself a person who has an higher attention to the details then the avarage, I immediately noticed the anomaly, where a consecutive series of accounts have posted and after several months are all with the same new signature.
I see nothing to connect any of them other than being registered in a three hour band of the day over a fifty day period.
The ethereum connections between accounts are provided and archived on #1 and later when new proofs has been discovered on #8 post of this thread.
As @Marlboroza noticed some accounts has been banned and I pretty sure (not 100% sure) that one banned account have the signature privilege removed. Si if the page has been achivied after the ban we can't see the previus signature on the profile.
Here we can find also eclezireex with a ban
https://bpip.org/profile.aspx?p=elcezireex
I've included
elcezireex account for 2 reasons
1-
0x2aD2095C9a563fA4aa2bE6d23Af4B92C62aB9751 elcezireex
https://bitcointalk.org/index.php?topic=4948249.msg46322488#msg46322488 http://archive.fo/heA2I#selection-3441.13-3441.55With this address
https://etherscan.io/address/0x2ad2095c9a563fa4aa2be6d23af4b92c62ab9751#tokentxnsWe can find a lot of transactions with
0x4288F22e8432241F5E49243b55885dC4328c444F Puyol
https://bitcointalk.org/index.php?topic=2322644.msg32914190#msg32914190 http://archive.fo/iu2gk#selection-6431.13-6431.55
2-
I've added one more old address for this user on post #8, I copy here the essential part
Where we can find more connections with some of the others accounts:
